ASP.NET實現下拉框二級聯動組件

namespace WebApplicationDlh
{
using System;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using Db;
/// <summary>
/// Area 的摘要說明。
/// </summary>
public class Area : System.Web.UI.UserControl
{
protected System.Web.UI.WebControls.DropDownList ddlProvince;
protected System.Web.UI.WebControls.DropDownList ddlCity;
public string strProvince
{
get
{
return ddlProvince.SelectedItem.Value;
}
set
{
ddlProvince.SelectedItem.Value = value;
}
}
public string strCity
{
get
{
return ddlCity.SelectedItem.Value;
}
set
{
ddlCity.SelectedItem.Value = value;
}
}
private void Page_Load(object sender, System.EventArgs e)
{
if(!IsPostBack)
{
ddlProvinceBind();
ddlCity.Items.Insert(0,"-請選擇城市-");
}
}
private void ddlProvinceBind()
{
Db.Area myArea = new Db.Area();
SqlDataReader dr = myArea.GetAllProvince();
if(dr.Read())
{
ddlProvince.DataSource = dr;
ddlProvince.DataTextField = "Province";
ddlProvince.DataValueField = "Province";
ddlProvince.DataBind();
ddlProvince.Items.Insert(0,"-請選擇省份-");
}
}
#region Web 窗體設計器生成的代碼
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 該調用是 ASP.NET Web 窗體設計器所必需的。
//
InitializeComponent();
base.OnInit(e);
}